BlackBerry, which has completed the first phase of its two-year turnaround plan, is now focused on profitability and will not spread itself thin by attempting to launch too many new devices, its chief executive said. John Chen, who took the reins at the struggling mobile technology company in November 2013, has moved rapidly to try to get the one-time investor darling back on track. “Once we turn this company to profitability again, I will do everything I can to never lose money ever again,” Chen told Reuters in an interview this week.